Após uma pequena pesquisa, parece que sua descrição corresponde ao Batman: O Cavaleiro das Trevas retorna filme animado. Como Boelabaal menciona nos comentários, esta é uma adaptação em duas partes da graphic novel de Frank Miller com o mesmo nome.
Da Wikipedia:
After the death of his protégé Jason Todd, billionaire industrialist Bruce Wayne was forced to retire from his Batman persona. Ten years later, Gotham City is overrun with crime and terrorized by a gang known as the Mutants. The 55-year-old Wayne maintains a friendship with 70-year-old retiring Police Commissioner James Gordon, while the Joker (Batman's archenemy) has been catatonic in Arkham Asylum since Wayne's retirement. Arkham inmate and former district attorney Harvey Dent undergoes plastic surgery to repair his disfigured face. Although he is declared sane, he quickly goes into hiding following his release. Dent's disappearance, news stories of the crime epidemic throughout the city and the memory of his parents' deaths drive Wayne to become Batman once more. He combats serious crimes, rescuing 13-year-old Carrie Kelley, but now struggles with the physical limitations of age.